newlib/libc/search/tdestroy.c

   1 /*      $NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $        */
   2
   3 /*
   4  * Tree search generalized from Knuth (6.2.2) Algorithm T just like
   5  * the AT&T man page says.
   6  *
   7  * The node_t structure is for internal use only, lint doesn't grok it.
   8  *
   9  * Written by reading the System V Interface Definition, not the code.
  10  *
  11  * Totally public domain.
  12  */
  13
  14 #include <sys/cdefs.h>
  15 #if 0
  16 #if defined(LIBC_SCCS) && !defined(lint)
  17 __RCSID("$NetBSD: tdelete.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
  18 #endif /* LIBC_SCCS and not lint */
  19 #endif
  20
  21 #include <assert.h>
  22 #define _SEARCH_PRIVATE
  23 #include <search.h>
  24 #include <stdlib.h>
  25
  26
  27 /* Walk the nodes of a tree */
  28 static void
  29 trecurse(
  30         node_t *root,   /* Root of the tree to be walked */
  31         void (*free_action)(void *)
  32 )
  33 {
  34   if (root->llink != NULL)
  35     trecurse(root->llink, free_action);
  36   if (root->rlink != NULL)
  37     trecurse(root->rlink, free_action);
  38
  39   (*free_action) ((void *) root->key);
  40   free(root);
  41 }
  42
  43 void
  44 tdestroy (void *vrootp,
  45        void (*freefct)(void *))
  46 {
  47   node_t *root = (node_t *) vrootp;
  48
  49   if (root != NULL)
  50     trecurse(root, freefct);
  51 }